{
  "id": "S264",
  "type": "单选题",
  "type_code": "single",
  "stem": "若随机变量[[IMG:16_image1.png]]，且σ已知，从中随机抽取样本[[IMG:16_image2.png]]，并经计算得到其均值为[[IMG:16_image3.png]],这时由[[IMG:16_image3.png]]估计μ的置信度为95%的置信区间时，置信区间的宽度（）。",
  "stem_text": "若随机变量[X ~ N(μ, σ²)]，且σ已知，从中随机抽取样本[x₁, x₂, …, xₙ]，并经计算得到其均值为[x̄],这时由[x̄]估计μ的置信度为95%的置信区间时，置信区间的宽度（）。",
  "options": [
    {
      "key": "A",
      "text": "是确定的"
    },
    {
      "key": "B",
      "text": "是随机的"
    },
    {
      "key": "C",
      "text": "是人为规定的"
    },
    {
      "key": "D",
      "text": "无法确定的"
    }
  ],
  "options_text": [
    {
      "key": "A",
      "text": "是确定的"
    },
    {
      "key": "B",
      "text": "是随机的"
    },
    {
      "key": "C",
      "text": "是人为规定的"
    },
    {
      "key": "D",
      "text": "无法确定的"
    }
  ],
  "answer_keys": [
    "A"
  ],
  "answer_display": "A",
  "answer_texts": [
    "是确定的"
  ],
  "sources": [
    {
      "edition": "第16届",
      "edition_num": 16,
      "no": 41,
      "uid": "16-041",
      "file": "第16届市调大赛本科组模拟题一(1).docx"
    }
  ],
  "source_display": "第16届 第41题",
  "source_count": 1,
  "images": [
    "16_image1.png",
    "16_image2.png",
    "16_image3.png"
  ],
  "warnings": [],
  "conflict": null,
  "url": "/q/S264.html"
}